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The grouped frequency table gives information about the time, in minutes, taken by 50 people to solve a puzzle - Edexcel - GCSE Maths - Question 9 - 2021 - Paper 2
Question 9
The grouped frequency table gives information about the time, in minutes, taken by 50 people to solve a puzzle. Time (m minutes) | Frequency -------------------|---... show full transcript
Worked Solution & Example Answer:The grouped frequency table gives information about the time, in minutes, taken by 50 people to solve a puzzle - Edexcel - GCSE Maths - Question 9 - 2021 - Paper 2
Step 1
Write down one thing that is wrong with this cumulative frequency table.
Answer
The cumulative frequency values in the table should be inclusive of the upper limits of each interval. For example, the entry for the interval 10 < x < 20 should be 5 + 8 = 13, which is correct. However, the entry for 20 < x < 30 is incorrect; it should be 5 + 8 + 12 = 25, which is also correct. The total cumulative frequency for the interval 30 < x < 40 is problematic because it skips some values. Instead of 40, it should be 5 + 8 + 12 + 15 = 40. Moreover, the last cumulative frequency value should be checked to ensure it adds up correctly to 50.